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Mastering Validation and Debug of Digital Systems...DDR memory validation wizard for DSA/DPO70000...
Transcript of Mastering Validation and Debug of Digital Systems...DDR memory validation wizard for DSA/DPO70000...
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Mastering Validation and Debug of Digital Systems
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Agenda
High Speed Serial Data Test Challenges
PCI Express® Digital Validation and Debug
DDR Memory Validation and Debug
– Probing
– Acquisition
– Analysis
DDR2 Demo
Summary
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High Speed Serial Test Challenges
Design Verification Compliance Test
Simulation Signal IntegrityEye and Jitter Analysis
Characterization & Validation
System IntegrationDigital Validation & Debug
Serial Data Network & Link Analysis
Data Link AnalysisDigital validation & Debug
Compliance Testing
Receiver TestDirect Synthesis
Transaction Layer
Data Link Layer
Phys
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Lay
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LogicalSub-block
ElectricalSub-block
pathTx +
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+
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Rx
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High Speed Serial Test Challenges
Giga-bit data rates require higher performance instruments– Decreased timing budget: Faster timing resolution– Transmission line effects: Low loading
Industry focus on reducing power consumption– Link width down configure for power savings and upconfigure when
additional bandwidth is required– Electrical Idle Entry and Exit for power savings, design ease, and
robustness
Industry standards are defining stringent measurement and analysis requirements
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Digital Validation & Debug
Data Access - ProbingRequires reliable physical connectivity with minimal loading
– Mid Bus Probes– Interposers– Instrument DIMMs– Direct probing to circuit board
Requires maximum signal integrity
Data AcquisitionTiming resolution high enough for thorough debuggingTrigger state machine flexible enough to trigger only on relevant eventsChannel count scalable and high enough to capture all required signalsScalable and time correlated system for cross bus analysis
Data AnalysisVerify and debug memory system operation
– Data valid windows– Read/Write data operation– DDR commands and mode register initialization
Quickly and easily identify protocol violationsAnalyze link training, power management, and advanced packet level decoding
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Agenda
High Speed Serial Data Test Challenges
PCI Express Digital Validation and Debug
DDR Memory Validation and Debug
– Probing
– Acquisition
– Analysis
DDR2 Demo
Summary
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Example - PCI Express Protocol Stack
Transaction Layer
Data Link Layer
Ph
ysic
al L
ayer
LogicalSub-block
ElectricalSub-block
Physical Layer – Logical Sub Block– Link Initialization and Training– Distribution of packet information over multiple
lanes– Power management and link power state
transitions
Data Link Layer– Flow control information– Data Integrity, Error Checking/Correction– Calculates/Check TLP Sequence Number– Calculate/Check CR
Transaction Layer– Creates Request/Completion Transactions– Messaging– TLP Flow Control
Physical Layer – Electrical Sub Block– Transmitter Signal Quality and Ref Clock
Testing– Receiver Testing– Interconnect Testing– PLL Loop BW
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Transmitter/Receiver
Lane
Link
Transmitter/Receiver
Power Up & Link Initialization
– Multi-lane systems (x1, x4, x8, x16)
– PCIe 1.0 <-> PCIe 2.0 systems compatibility:Speed negotiation from 2.5Gb/s to 5.0Gb/s and 5.0Gb/s to 2.5Gb/s
– Dynamic speed & link width changes
Active State Power Management
– Power Management:Electrical Idle Entry and Exit for power savings,
– Dynamic link width and link speed changes depending on data transfer volume requirements
A PCIe Bus Remains Part of a Total System
– Critical cross bus dependencies increase with speed
– Time-correlated visibility across multiple buses
– Signal access across the entire system
Power management and link training continue to be the most difficult challenges
Primary PCIe 2.0 Digital Debug Challenges
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Primary PCIe 2.0 Digital Debug Challenges
SUT device indicates it’s entering L0s
10 Fast Training Sets displayed (not all FTSsshown here). The SUT actually sent 22.
COM,SKP detected on all lanes and is re-aligned.
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Power management– Less energy consumption– Longer battery lifetime– Government regulations: EnergyStar®
PCIe 2.0 power management implementations
– Dynamic link width changes depending on current data transfer volume.
– Dynamic link speed changes depending on data transfer requirements (2.5Gb/s <-> 5Gb/s)
– Short term idle states of one or both direction of a link (L0s, L1)
– L0s: autonomous Idle-state of a link for a very short time
– L1: short term Idle-state initiated by a higher level protocol
PCI Express 2.0 – Power ManagementASPM Active State Power Management
When a lane is in Idle,no Power is consumed
by that lane
Need for Lower Power Consumption and Longer Battery Life
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Power Management Sequence (L0s-example)
L0s Power management is being used more frequently in PCI Express designs
L0s: autonomous Idle-state of one or both direction of a link for a very short time
– Efficiency depends on how fast a system can enter and exit the L0s state.
– L0s Exit Latency is measured by the number of “Fast Training Set’s” (FTS) packets required by the system, to exit the L0s state.
– Number of FTS = 1…255 (~16nS…4µS)
Past designs have exhibited failures during ASPM events, thus visibility of these events is critical to the debug engineer
PCI Express 2.0 – Power ManagementASPM Active State Power Management
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How to Debug:
Detect and quickly re-sync as the bus employs ASPM in order to acquire all packets as the link exits L0s
Tektronix supports maximum visibility of these transitions
– Typical sync within 12 FTS packets for both 2.5Gb and 5Gb
PCI Express 2.0 – Power ManagementASPM Active State Power Management
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Multiple Analysis OptionsPacket Decode and Multi-bus Correlation
Packet Decode and Transaction support in the Listing Window– Complete decode of PCI Express Packets– Symbolic decode on a lane by lane basis – View Tx and Rx in a common listing window or lock listing windows for transaction
support
Quick insight to system problems- View all system buses in the waveform window
– View all system buses correlated to the TLA common system timestamp– Correlate analog and digital waveforms
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Correlate Cross Bus Data
Graphics BusresponseTLP MWr to15325EC0h
FSB issues a Memory Write to Address 15325EC0h
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Performance– Auto detect 2.5Gb/s to 5.0Gb/s data rate change– Dynamically track link width Upconfigure/Downconfigure – World class ASPM support - L0s and L1 sync time
Visibility– Correlate all system buses to the common TLA timestamp– Import scope waveforms for analog / digital correlation– See the data you want with HW and SW filtering 32M
8b/10b symbols per lane acquisition depth
Flexibility– Backwards compatible to PCIe 1.x (data rate/footprint)– Acquire x1, x4, and x8 links in a single TLA7S16 module– Acquire x1 and x4 links in a single TLA7S08
Best Probing Solution– Mid-bus or Interposer probing options at 5.0Gb/s– Minimal impact on probed signals– No need for multiple probes to support different routings– Easy access to SUTs with 6 foot cable length– C-springs are integrated with the retention mechanism
Complete System Digital Debug & Design VerificationPCI Express 2.0 Logic Analyzer Solution
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Agenda
High Speed Serial Data Test Challenges
PCI Express Digital Validation and Debug
DDR Memory Validation and Debug
– Probing
– Acquisition
– Analysis
DDR2 Demo
Summary
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Memory SystemsGigabit Data Rates
DDR/2/3 SDRAM– Driven by increasing computer
performance
– Performance doubles every ~ 3 years
Complex parallel bus– Fast clock speeds– Small data valid eyes
– Small timing margins– Crosstalk, impedance & jitter
Memory system verification is critical to reliable product operation
1.58001600DDR3-1600
1.8400800DDR2-800
SDRAM Standards
2.5133266DDR-2662.5166333DDR-3332.5200400DDR-400
1.59331867DDR3-1867
1.56671333DDR3-13331.55331066DDR3-10661.5400800DDR3-8001.85331066DDR2-1066
1.8334667DDR2-6671.8267533DDR2-5331.8200400DDR2-400
VMHzMT/SVDDClock
Data RateSDRAM
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Tektronix Platform Validation System Complete System Visibility with Time Correlation
Nexus Technology DDR3 NEXVu
PCI Express 2
DDR3 Direct Probing
QPI Bus
Electrical compliance test
DD
RD
DR
DD
R
IOH
CPU
DD
R
DD
R
DD
R
DD
R
DD
R
DD
R
PCIe2
TLA7000 Series Logic Analyzer with Nexus Memory Supports
DPO/DSA70000 Series Oscilloscope
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DDR/2/3 Verification & DebugMemory protocols & data
Operations, Commands & Data– Memory initialization
– Mode registers settings
– Read & write data– Command sequences & timing– Data valid windows– Export read & write data to other tools
– Time correlated memory operations– With oscilloscope waveforms – Other buses (QPI, FSB, PCI-Express 2, etc)
TLA7000 Series Logic Analyzers with Nexus Memory Supports
Capture errors that cannot be captured or be seen by other logic analyzers with 20 ps high resolution timing
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Logic Analyzer ProbingDDR/2/3 SDRAMs, DIMMs & SODIMMs
Direct probing to circuit board
Interposers
NEXVu instrument DIMMs
240 pin unbuffered DDR3 DIMM NEXVu
DDR3 DIMM interposer
Direct probing
Lowest probe loading in industry at <0.5pF
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NEXVu: Instrumented DIMMsJEDEC layout with measurements at the Memory IC pins
Logic analyzer probe
240 pin unbuffered DDR3 UDIMM
Best measurement of the signal quality at the memory IC.
Signals are probed at the memory IC pins with an inner circuit board isolation resistors to reduce probe loading.
Memory sockets
Visibility of signals as seen by the memory chips
Least signal integrity intrusive
Logic analyzer connects above the normal DIMM height
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DDR3 240–pin UDIMM Signal SkewNo ECC
Fly-by command/address/control bus with On-DIMM termination
System level flight time compensation
Read Data& Strobes
Fly-by command/address/control bus
DQS0
DQS7DQS4
DQS3
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Write Data Strobes Skew AnalysisLogic Analyzer MagniVu 20 ps (50 GS/s) timing resolution
Oscilloscope timing performance on all logic analyzer channels all the time
1.27ns DQS6 to DQS0 skew captured with 20ps timing resolution
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Logic Analyzer Probes used by the Oscilloscope
TLA Logic Analyzer P6860 Probe (34ch)
TLA BNC Cables
iCapture: Logic Analyzer integrated digital/analog probe
TLA BNC Cables
TLA7016 & TLA7BB4s Any Oscilloscope
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DDR3 DQS2 Strobe WaveformAmplitude problem with Read strobe from DIMM
Read Strobe
Write Strobe
Logic analyzer probes used by the oscilloscope
Read Strobe Amplitude Problem
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TriMode Probing for DSA/DPO70000 scopes
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DDR memory validation wizard for DSA/DPO70000 series
Steps to completion:
1. Speed selection and Vref detection (automatic or manual)2. Different types of measurements for different bursts3. Chip Select Qualification to provide selective Read/Write Bursts 4. Detection of levels is automatic - or – customized5. Threshold scaling
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Measurements and configuration
Compliance and analysis supportMeasurements on all edges and burstsJEDEC DDR measurements and serial data measurement library
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Analog Validation of DDR memory
Data Eye Diagram with Strobe information
Quickly switch to DPOJET for powerful debug and analysis capabilities
Complete Measurement Report
Waveform screenshots, eye diagram, and detailed setup information
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Mode Register AnalysisOnly 4 MRS Commands Captured at Power-on
SDRAM MRS2, MRS3, MRS1 & MRS0 configured by the memory controller at power-on & reset
Logic analyzer selective storage captures only useful information
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State Acquisition TLA7BB4 Data Valid Window: 200 mV, 240 ps (merged)
5 mV, 20 ps positioning
Eye diagram courtesy of Intel
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Write Data 64-bits Analysis Verify state write data groups with MagniVu timing data
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Selective Clocking Acquires More Useful InformationNotice Timestamp changes for DESL cycles not stored
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Nexus Protocol Violation SoftwareDDR3/DDR2 Protocol Checking
Summary/Statistical Info.
Bus/TLA Memory
Utilization
Quickly display problem
areas in Listing &
Waveform windows
Customizable timing
parameters
Export data
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Memory SystemVerification & Debug
DDR/2/3 SDRAM – Initialization & mode register– Commands & read/write data– Waveforms– Protocol violation checking
Selective clocking– Stores useful data in the TLA– Filters refresh & deselect cycles
Pre-defined symbols for easy analysis & trigger setup Three simultaneous measurements through one probe– State acquisition– High-resolution 20 ps (50GS/s)
MagniVu timing with TLA7BB4– Oscilloscope analog waveforms
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Agenda
High Speed Serial Data Test Challenges
PCI Express Digital Validation and Debug
DDR Memory Validation and Debug– Probing
– Acquisition
– Analysis
DDR2 Demo
Summary
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DDR2 Demo SetupTLA7BB4, TLA7S16 & TLA7012 Logic
Analyzer with second display
DDR2-533 & PCIe 2 development board
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DDR2 Demo
Mode Register Set
Refresh Error
Refresh Valid
Read Data 123
Read Data 123 Waveform View
Write Trigger
Selective Clocking
Direct probing DDR2-533 with two P6960 logic analyzer probes
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Agenda
High Speed Serial Data Test Challenges
PCI Express Digital Validation and Debug
DDR Memory Validation and Debug– Probing
– Acquisition
– Analysis
DDR2 Demo
Summary
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High Speed Digital Test Challenges
Design Verification Compliance Test
Simulation Signal IntegrityEye and Jitter Analysis
Characterization & Validation
System IntegrationDigital Validation & Debug
Serial Data Network & Link Analysis
Data Link AnalysisDigital validation & Debug
Compliance Testing
Receiver TestDirect Synthesis
Transaction Layer
Data Link Layer
Phys
ical
Lay
er
LogicalSub-block
ElectricalSub-block
pathTx +
-
+
-
+
-
+
-
Rx
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High Speed Digital Verification & DebugProtocols, Data, Signal Quality & Circuit Board Trace Quality
Circuit Board Trace Quality – CSA8200 Sampling Oscilloscopes
Memory Protocols & Data– TLA7000 Logic Analyzers
Signal Quality– DPO/DSA70000 Series
Oscilloscopes
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PCI Express Information
Tektronix– www.tektronix.com/pci_express
PCI Special Interest Group (PCI-SIG®)– www.pcisig.com
PCI Express Test Procedures– www.pcisig.com/specifications/pciexpress/compliance/compliance_library
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Memory Information
Tektronix– www.tektronix.com/memory
Nexus Technology– www.nexustechnology.com
Memory Implementers Forum– www.memforum.org
JEDEC– www.jedec.org
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Thank You!
Contact your local Tektronix Account Manager for more information